When initializing a new MW database (this should not happen if database already exists and needs to be updated), vagrant should create a set of test pages to work with.
Based on my past experiences, I would recommend about 15 regular pages, some in non 0 namespace, at least 2 templates (one - nested), some categories, and possibly an image file or two. Most edits should be done as if by the administrator, plus a few - by anonymous user. All pages should at least be linked from the main page. Some pages should be watched by admin.
In short, the wiki should not be pristine, allowing for all sorts of functionality instantly testable without page creation.